I have an editor, which selects another EditPart programatically and it works so long. But the properties view isn't updated.

With the debugger I found out, that the system gets the right property object, but the values and so on aren't shown in the property view.
I use the selectionChanged method from the UndoablePropertySheetPage.

propertyPage.selectionChanged(this, new StructuredSelection(editPart));